Study On Laser Properties Of Neodymium Ion Doped Sesquioxide Ceramics

In this paper,the laser properties of Nd:Lu₂O₃,ceramics grown by spark plasma method are studied,Neodymium elements are rare earth elements,neodymium ion rich energy level structure determines it in the vicinity of lun band can produce different wavelengths of the transition.;On the other hand,the sesquioxide ceramics has the advantages of high thermal conductivity,high density,wide band gap and so on.It has become a hotspot in recent years,Neodymium ion doped sesquioxide ceramic laser has a unique advantage,It is expected to provide a path for the development of solid-state lasers and the exploration of laser beam materials with better performance.Laser ceramic growth methods are diverse,The growth of laser ceramics by spark plasma method has the advantages of uniform structure and compactness.The fluorescence spectra of the Nd:Lu₂O₃ ceramic grown by the spark plasma method were measured.the results show that there is a strong emission line near lum,the strongest lines are near 1078 nm and 1080 nm,this illustrates that Nd:Lu₂O₃ ceramic is excellent for laser gain media;The absorption spectrum of the ceramic was measured,and a strong absorption spectrum was found near 807 nm,which provided the basis for selecting the appropriate pump source.In the experiment,the 807nm semiconductor laser was used as the pump sourace,and linear cavity is designed in order to contrast annealed and unannealed,coated and uncoated ceramic laser properties,The laser cavity of the annealed and unannealed,coated and uncoated ceramic was designed.The results show that the ceramic laser output performance?output power,slope efficiency,etc.?To be significantly better than unannealed and uncoated ceramic,The results show that the ceramic laser output performance?output power,slope efficiency,etc.?of the annealed and coated ceramic is significantly better than that of the unannealed and uncoated ceramic.Finally,the Nd:Lu₂O₃ ceramic V-cavity laser output experiment was designed to demonstrated high efficient laser operation.On the transition from ⁴F_3/2?to⁴/_11/2,the 1076.7nm and 1080.8nm dual wavelength were obtained.The maximum output power was 1.25W and the slope efficiency was 38%.On the transition from 1F3/2 to 4I13/2,,The laser operated at the wavelength of 1359.7nm,the maxiun output of 200mW was obtained.The cavity round trip cavity loss at the output mirror transmitters were measured at T = 0.8%,1.6%,3.5%,5%and 9%,respectively.In the case of a pump power of 3W,the optimal transmittance of the output mirror is determined.The results of our experiments are one of the best results in the laser properties of gain media that have been reported so far,especially in terms of slope efficiency.Based on the oscillation threshold method,we also measured the dynamic loss of neodymium glass rods.Neodymium glass rods are a laser gain medium that is currently the only type of gain medium used in laser fusion loses.Based on the project task,we conducted a test study on the dynamic loss of two types of neodymium glass rods.The loss here is the loss under pump conditions,unlike the static loss without pump.After comparing measurements,we can find that the test of the two neodymium glass rod loss is in the range of 0.002-0.004,in view of the small number of samples,our test results can only be used as a preliminary basis.